Polarization independent optical circulator

Details Polarization independent optical circulator Polarization independent optical circulator

G - Physics

02

B

88/117, 88/99

G02B 5/30 (2006.01) G02B 27/00 (2006.01) G02B 27/28 (2006.01) G02F 1/09 (2006.01)

Patent

CA 1128347

ABSTRACT OF THE DISCLOSURE An optical circulator in which non-reciprocal polarized light rotating means is disposed between first and second polarizing prisms, the non-reciprocal polarized light rotating means being composed of a Faraday rotator that the polarized light rotating angle, for example, by an external field is 45° and compensating means of an optically active or anisotropic crystal that the polar- ized light rotating angle is 45°. A light passing through the non- reciprocal polarized light rotating Means in one direction is rotated through 90° but a light passing through the non-reciprocal polarized light rotating means in a reverse direction is not rotated. Two input/output faces of each of the non-reciprocal polarized light rotating means and the first and second polarizing prisms are opti- cally coupled, and the remaining input/output faces of the first and second polarizing prisms, four in all, are used as first through fourth input/output ports, respectively. - 25 -

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